XPfindSize()
  Return Size of File Found.
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   Function:   XPfindSize()

               XPfindsize() returns the size of the file found after
               the last XPfindFirst()/XPfindNext() call.

   Syntax:     XPfindSize(<DTA>) --> nFileSize

   Arguments:  <DTA> is the 43 bytes variable given to FindFirst/Next.
               Need not to be passed by reference here.

   Returns:    The filesize, in bytes. Directory entries and
               Volume labels (should) return 0 bytes.

   Usage:      See XPDEMO.PRG.